Great looking ponds. You can plant Jap Millet but the cows will probably graze it down to nothing. The reason why Jap Millet is so desireable to ducks is do to its waterproof seed that resist spoiling in high moisture enviroments. Since the cattle will never let the millet head out, it would probably be better to plant wheat or oats around the ponds. Simply because it will make a better stand on the dry banks and all you are gaining is habitat for invertabrits which ducks often feed on.